Doubletree-equalizer



(No Model.)

J. A. HAAS.

DOUBLETREE BQUALIZER. No. 392,862. Patented N0v. l3, 1888.

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Inventor.

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the cap in Fig. 6 from a point above; Fig. 7,

of the end piece, D, are provided with lugs 8 UNITED STA ES JOHN A. HAAS, OF MENDON, MICHIGAN.

DOUBLETREE- EQUALIZER.

SPECIFICATION forming part of Letters Patent No. 392,862, dated November 13, 1888.

Serial No. 282.752. (No mod cl.)

To aZZ whom it may concern.-

Be it known that I, JOHN A. HAAS, a citizen of the United States, residing at Mendon, county of St. Joseph, State of Michigan, have invented a new and useful Doubletree-Equalizer, of which the following is a specification.

This invention has for its object the belowdescribed and claimed construction and associations of parts designed to effect the useful results pointed out in the specification.

In the drawings forming a part of this speeification, Figure l is a plan of one end of the doubletree; Fig. 2, a view of parts in Fig. 1, pointed out bylike letters,l,ooking from a point below said Fig. 1; Fig. 3, an inside view of part B in Fig. 1; Fig. 4, a view of the end piece of the spring-case in Fig. 1, looking from a point at the right; Fig. 5, a view looking at an end view of Fig. 1, looking from a point at the right, parts being broken; Fig. 8, a view of parts in Fig. 1, pointed out by like letters, looking from a point below the latter-named figure; Fig. 9, a view of the broken end of the doubletree in Fig. 8; and Fig. 10 is the broken part 8f the draw-bar in perspective shown in Referring to the letters marked on the draw" lugs, A points out a broken end of the wood part of a doubletree. On the back of the part A is a strap of iron, B, and G is a like strap on the front side,both being bolted to the part A and projecting beyond the end thereof. The inner sides of the straps at the end have curved grooves 6, Fig. 3, into which grooves the ends of the end piece, D, are inserted. The ends 0', the latter of which lugs are headed. The straps B C are slotted, as at S,and the headed lugs r of the end piece, D, are passed through the large part of the slot S and then carried back into the narrow branch of said slot, the branches being narrower than the diameter of the heads of the lugs r. The lugs 0 of the end piece, D, catch over the edges of the straps B (l, and thus the end piece, D, is firmly and de tachably attached to the end of the straps B 0 after the bolts which secure thestraps to the part A have been tightened. The end piece, D, on the inside and the end of the part A are concave, and in the space between said concave surfaces and the straps B G the spiral spring a is located. Thus the concave end of part A, the end piece, D, and the projecting ends of the straps B 0 form a case for containing the spring a. In Figs. 8 and 9 the concavity of the part A is clearly shown at 2.

In Figs. 1, 5, and 6 a cap, o, is shown, the flanged end of which fits against the inside of the projecting end of the strap B. This cap 1; has an oblong hole, 3, Fig. 5,entirely through it, and an oblong hole, 4, extending from the back or flanged end of the cap into said cap, but not extending through the front wall, 0, of said cap. Said slots 3 4 cross each other at right angles, Fig. 5.

The draw-bar 0, Figs. 1, 6, 7, and 10, has a hook at one end and aT-head at the otherend. The T-head is of a proper size and form to pass through the slot 3 of the cap 2). After it is thus passed through the slot 3 the cap '12 is given aquarter-turn and the drawbaris drawn forward, bringing the T-head a into the slot 4 of the cap 0 and against the front wall, a, of said cap, Fig. 6.

The large part of the slot S in the strap 0, Fig. 2, is horizontally oblong, and the drawbar 0 is passed through said slot. The spring a surrounds the draw-bare in thespringease, and the body of the cap 0 is passed into the back end of said spring, Fig. 1.

On the front face of the projecting end of the strap 0 is a boss, d, having a straight side or cut-away portion, 5, Fig. 2. By this means, when the hooked end of the draw-bar c is turned down ilatwise, as in Fig. 1, the ring of the singletree (not here shown) can be hooked onto the hook of the draw-bar 0, and then by turning the hook up to its used position, Fig. 7, the ring of the singletree cannot unhook from said book of the draw-bar 0, because there is not sufiicient space between the end of the hook and the boss (I to admit of its unhooking.

When the draw-bar c is turned to its different positions to hook and unhook the singletree, the cap 22 turns with it, because of the interlocking of the T-head a with the cap in slot 4. Thus the draw-bar is swivelcd and can o C, Fig. .i,

at the hooked end in case the team shcers to the right or left. Thus the implement is not drawn out of its proper course-a thing especially desirable in using cultivators and the like.

By the use of the spring in connection with the draw-bar the shock to the team and implement, caused by a sudden start of the team or a sudden resistance of the implement, is obviated.

It will of course be understood that both ends of the doubletree are constructed the same as the end here shown and described.

I have especially aimed to make all the parts easy of construction and mechanically simple 7 through the caps and the other extending to the front wall of the caps, and the headed draw-bars, substantially as set forth.

3. Adoubletree having the end spring-cases, the spring and caps in said cases, the drawbars having the end hooks and passed through said springs, the rear end of the draw-bars being interlocked with the caps, the hooked ends passed through slots in the front wall of the spring-case, and the bosses on the front side of y the case and around the slots, all combined v substantially as set forth.

4. A doubletree having the back and front straps, the ends extending beyond the doubletree wood,having slots with narrowerbranches, and the end piece provided with the cornerlugs, and the central headed lugs formed to pass into said narrower branches of the slots, in combination with the spiral springs and draw-bars, substantially as set forth.

In testimony of the foregoing I have hereunto subscribed my name in presence of two witnesses.

JOHN A. HAAS.

Witnesses:

Gno. W. MATTIoE, L. J. MEAOHAM. 

